Download Computer, Network & Internet Security by Brett C. Tjaden PDF

By Brett C. Tjaden

Computing device safeguard matters reminiscent of viruses and hacking are more and more making headlines. This extensive examine the sphere of laptop safeguard is geared toward execs trying to find a radical assessment of concerns surrounding huge computers within the context of community computing, extensive zone networks, and pcs associated with the net and world-wide-web. integrated are info about the underlying rules, algorithms, and ideas which are critical to the upkeep of safe daily computing. The threats to desktops in networked environments or attached to the web are indexed and analyzed. day-by-day occasions reminiscent of privateness and integrity assaults, site visitors research, and denial of provider are explored.

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0 Identification and Authentication The first step toward securing the resources of a LAN is the ability to verify the identities of users [BNOV91]. The process of verifying a user’s identity is referred to as authentication. Authentication provides the basis for the effectiveness of other controls used on the LAN. For example the logging mechanism provides usage information based on the userid. The access control mechanism permits access to LAN resources based on the userid. Both these controls are only effective under the assumption that the requestor of a LAN service is the valid user assigned to that specific userid.

The types of security mechanisms that could be implemented to provide the message and data confidentiality service are listed below. • • • • file and message encryption technology, protection for backup copies on tapes, diskettes, etc, physical protection of physical LAN medium and devices, use of routers that provide filtering to limit broadcasting (either by blocking or by masking message contents). 3 Data and Message Integrity The data and message integrity service helps to protect data and software on workstations, file servers, and other LAN components from unauthorized modification.

The disclosure of LAN data or software occurs when the data or software is accessed, read and possibly released to an individual who is not authorized for the data. This can occur by someone gaining access to information that is not encrypted, or by viewing monitors or printouts of the information. The compromise of LAN data can occur by exploiting the following types of vulnerabilities: • improper access control settings, • data, that has been deemed sensitive enough to warrant encryption, stored in unencrypted form, • application source code stored in unencrypted form, • monitors viewable in high traffic areas, • printer stations placed in high traffic areas, • data and software backup copies stored in open areas.

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